4b-8=12
+8 +8
4b=20
Divide both sides by 4
B=5
C because the first one she picks is 1/6 chance and since she took one there's five left so the second marble is 1/5 and when you multiply 1/5 and 1/6 it is 1/30
Answer:
Step-by-step explanation:
2n^2-20=0
2n^2=20
n^2=20÷2
n^2=10
n=radical 10
Answer:
D. 10^10
Step-by-step explanation:
Multiplying numbers with exponents rule : 
explanation of rule : we simply keep the bases the same and add the exponents.
10^3 • 10^7
keep the base as 10 and add the exponents

Keep in mind that this only works when the bases are the same.